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Golden pencilfish — AI-generated side-view illustration

Golden pencilfish

Nannostomus beckfordi

A slender pencil shape with one prominent dark lateral stripe

Golden-silver colour and reddish belly or fins vary with sex and display. There is no adipose fin.

Adult length
Up to 6.5 cm (standard length, without the tail fin)
Water temperature
21–27 °C
pH
5–8
Hardness
1–15 dGH
Natural habitat
Inhabits small rivers with little current and swamps.

Males compete; multiple males need more room and broken sightlines.

View comparison →

Appearance and identification

Compare the compact three-striped dwarf pencilfish, the black neon's contrasting stripe, and the spotted, head-up diptail pencilfish.

Same-species behaviour

Keep around ten or more; watch weaker individuals and feeding.

Space requirements

Allow 60–80 cm of length for eight to ten. Multiple males need more space than a 45 × 30 cm base.

Diet and feeding

Use fine dry food and small frozen or live foods.

Compatibility limits

Avoid dominant feeders; quiet surface fish can also be disturbed in small aquaria.

Aquarium environment

Use plants and floating cover to break sightlines, with gentle flow and swimming space.

Sources

www.fishbase.se ↗ 2026-10-25

www.seriouslyfish.com ↗ 2026-10-22

mczbase.mcz.harvard.edu ↗ 2026-10-22

researcharchive.calacademy.org ↗ 2026-10-22

pecescriollos.de ↗ 2026-10-22

www.aquarium-dietzenbach.de ↗ 2026-10-22

www.tfrin.gov.tw ↗ 2026-10-22

www.fishbase.org ↗ 2026-10-22

www.researchgate.net ↗ 2026-10-22

www.aquariumglaser.de ↗ 2026-10-22

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